(log-view-(msg|file)-(prev|next)): Rename from
log-view-*-(message|file) and use easy-mmode-define-navigation. (log-view-message-re): Match SCCS format as well. And match the revision line rather than the dashed separator line. (log-view-mode): Use the new define-derived-mode. (log-view-current-tag): Fill in with an actual implementation.
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